How to install iOS 9.x Simulator on Xcode 11?
It seems iOS 9 simulator is supported by Xcode 11, but only on macOS 10.14 Mojave. After upgrade to macOS 10.15 Catalina, this simulator is not supported any more.
Though I didn't find confirmation of this in any release notes. The only acknowledgment I found is this tweet by Apple engineer: https://twitter.com/xenadu02/status/1140093901438689280?lang=en